Here is what I ended up doing:
1 measured the pre-disassembly rotational torque with the wheels off using a dial inch pound torque wrench. It was between 30 - 35 in/lb (needle on the dial torque wrench fluctuates)
2 did the disassembly (forgot to count threads) and pulled the seal, cleaned everything up, used mopar seal 68056356aa, added some rtv to the seals mating surface. The seal already had grease in it.
3 Lubed the flange seal surface with gear oil, put some RTV on the flange splines, put some RTV on the flat of the nut.
4 Installed pinion flange and tightened the pinion nut (mopar 6507901AA) to 100 ft/lb, checked rotational torque. Continued this process adding 5 ft/lb of torque each time until rotational torque was 35 - 40 in/lbs. Ended up with final torque at 180 ft/lb. Dented in the part of the nut that corresponds to the indentations on the end of the pinion shaft to keep the nut from loosening.
5 Added gear oil till it came out the fill hole.
6 Took the truck on a 15 minute test drive on roads ranging from 30 MPH to interstate at 75+ MPH.
7 No whining, vibrations, or leaks.
What do you think?